[ 3.8.y.z extended stable ] Patch "vfs: allow O_PATH file descriptors for fstatfs()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    vfs: allow O_PATH file descriptors for fstatfs()

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From e6dfd65746c0a3d9303479cba4716ff9a118df0c Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds at linux-foundation.org>
Date: Mon, 30 Sep 2013 08:35:10 -0700
Subject: vfs: allow O_PATH file descriptors for fstatfs()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit 9d05746e7b16d8565dddbe3200faa1e669d23bbf upstream.

Olga reported that file descriptors opened with O_PATH do not work with
fstatfs(), found during further development of ksh93's thread support.

There is no reason to not allow O_PATH file descriptors here (fstatfs is
very much a path operation), so use "fdget_raw()".  See commit
55815f70147d ("vfs: make O_PATH file descriptors usable for 'fstat()'")
for a very similar issue reported for fstat() by the same team.

Reported-and-tested-by: ольга крыжановская <olga.kryzhanovska at gmail.com>
Acked-by: Al Viro <viro at zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 fs/statfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/statfs.c b/fs/statfs.c
index c219e733..083dc0a 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -94,7 +94,7 @@ retry:

 int fd_statfs(int fd, struct kstatfs *st)
 {
-	struct fd f = fdget(fd);
+	struct fd f = fdget_raw(fd);
 	int error = -EBADF;
 	if (f.file) {
 		error = vfs_statfs(&f.file->f_path, st);
--
1.8.1.2